Artemisia. COMPOSIT-S:. 421 



large panicle, with smaller glomerate-spicate heads: from A. Purshiana [that 

 is A. Liidoviciana] in its strict stem, acuminate (not mucronate) leaves, 

 elongated branches of the panicle, larger heads, the involucre not canescent- 

 tomentose, the whole plant less canescent, and the leaves green above. Bess. 

 — We have a plant collected by Douglas, which accords with the above 

 character, except that the upper surface of the leaves and the heads are 

 clothed with a loose, woolly, but apparently deciduous pubescence. 



19. A. vulgaris (Linn.): perennial, erect ; leaves whitish-tomentose be- 

 neath : the cauline pinnatifid, with the lobes either laciniate, incised, coarse- 

 ly serrate, or entire; the uppermost nearly linear and entire ; heads spicate- 

 paniculate, ovoid, nodding, at length erect; the panicle leafy and spreading; 

 exterior scales of the involucre canescently tomentose; the inner scarious; co- 

 rolla a;labrous. Bess..' in Hook. I. c, 6f DC. I. c. — Linn. spec. 2. p. 848 ; 

 EngCbol. t. 978 ; Michx. ! fl. 2. p. 128 ; Pursh, fl.. 2. p. 522 ; Nutt. gen. 2. 

 p. 144; DC! prodr. 6. p. 112. A. heterophylla, Nutt. .' in trans. Amer. 

 phil. sac. I. c— A dozen varieties of this polymorphous and widely diffused 

 species are described by Besser and DeCandolle; of which the American 

 forms are, 



a. vulsatissima (Bess. 1. c.) : lobes of the leaves linear-lanceolate, the low- 

 er scarcely incisely toothed ; panicle ample, erect. 



/3. Kamtschatica (Bess. 1. c.) : cauline leaves bipinnatifid, with linear lobes, 

 those of the lower ones toothed ; spikes dense, branched at the base ; the spike- 

 lets nodding ; heads ovate ; scales of the involucre with scarious margins, 

 smooth and shining. 



y. Californica (Bess, in Linnsea, 15. p. 91), which is said to represent the 

 opposite extreme, and to connect A. integrifolia with this species ; the lower 

 leaves being merely unequally 3-cleft. — A. integrifolia, Less, in Linncea, I. 

 c. ; Hook. Sf Am. hot. Beechey, p. 150. 



6. Mexicana : lower leaves pinnatifid, the upper trifid ; the lobes, like the 

 uppermost leaves and those of the branches, linear-lanceolate, very acute, 

 entire, with revoliite margins; the upper surface as well as the branches 

 often canescent when young ; heads small, tomentose-canescent ; flowers ful- 

 vous.— A. Mexicana, 'WMd. ? DC. I. c. 1 {Cf. Bess, in Linncea, 15. p. 107.) 

 A. vulgaris var. Americana, Bess, in Linntea, I.e. p. 105, in part. (spec. 

 Engebn.) 



Wastg places, var. a. {Mugicort) introduced from Europe, and more or less 

 naturalized ; but native in British America. From Vermont {Dr. Mob- 

 bins .') we have a state with the leaves all pinnatifid, and the lobes broad 

 and mostly obtuse ; apparently like the plant described by Nuttall, from se- 

 questered forests of North Carolina. /?. Unalaschka, (fee. y. California, 

 Chamisso. 6. Arkansas, Dr. En gelmann! Dr. Leavenworth! Texas, Drum- 

 mond! Dr. Riddell ! Berlandier ? — The A. vulgaris, Bess, in Hook. I. c, 

 from Arctic America, and subsequently indicated as var. Americana, we 

 cannot distinguish from A. Tilesii. 



20. A. Tilesii (Ledeb.): perennial, erect; stem simple; leaves whitish- 

 tomentose beneath, pinnatifid [or trifid]; the lobes lanceolate, acuminate, 

 somewhat toothed ; heads racemose-paniculate, crowded, globose, somewhat 

 nodding ; branches of the panicle short ; scales of the involucre arachnoid- 

 tomentose, scarious; corolla glabrous. Bess.! in Hook. I.e., i^ DC. I.e. — 

 Ledeb. in mem. acad. St. Petersb. 5. p. 568 ,• Less, in Linntea, 6. p. 214 ; 

 Bess, in Linncea, 15. p. 106. 



/3. arctica (Bess. 1. c.) : leaves laciniate-pinnatifid ; the lobes entire, short, 

 obtuse; involucre pale, scarcely woolly when old. 



y. Unalasehkensis (Bess, in Linnsa, 1. c.) : leaves mostly deeply trifid ; 

 the middle segment very much larger than the lateral ; all lanceolate, acute, 

 slightly and unequally toothed [often entire] ; flowers purplish-brown. 



